Per Share Data (Diluted EPS Calculation Continuing Operations) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net income from continuing operations	$ 339	$ 286	$ 693	$ 605
Less: Net income attributable to non-controlling interests	8	7	15	13
Net income attributable to the Company	329	282	676	607
Basic weighted average common shares outstanding (in shares)	545	547	544	545
Diluted weighted average common shares outstanding (in shares)	553	555	552	554
Continuing Operations [Member]
Net income from continuing operations	339	286	693	605
Less: Net income attributable to non-controlling interests	8	7	15	13
Net income attributable to the Company	331	279	678	592
Less: Portion attributable to participating securities	0	1	1	4
Net income attributable to common shares for diluted earnings per share	$ 331	$ 278	$ 677	$ 588
Basic weighted average common shares outstanding (in shares)	545	547	544	545
Dilutive effect of potentially issuable common shares	8	8	8	9
Diluted weighted average common shares outstanding (in shares)	553	555	552	554
Average stock price used to calculate common stock equivalents	$ 32.31	$ 30.03	$ 32.13	$ 29.47